Oracle sqlplus连接很慢

   一个测试库上有很多个用户，其中的一个用户修改密码之后，就出现了连接缓慢的情况，而这个数据库上其他的用户连接没有问题。这种问题得先用strace跟踪一下：

strace -T -t -o /tmp/s.out sqlplus test/test

-T  Show the time spent in system calls. This records the time difference between the beginning and the end of each system  call.

-o  Write the trace output to the file filename rather than to stderr. 

-t  Prefix each line of the trace with the time of day.

13:55:09 execve("/data1/oracle11g/product/11.2.0.4/db_1/bin/sqlplus", ["sqlplus", "lcam_zc_0130/lcam_zc_pzgpassword"...], [/* 32 vars */]) = 0 <0.000364>

13:55:09 brk(0)                         = 0x1ea1000 <0.000040>

13:55:09 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f32071aa000 <0.000025>

13:55:09 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) <0.000044>

13:55:09 open("/data1/oracle11g/product/11.2.0.4/db_1/lib/tls/x86_64/libsqlplus.so", O_RDONLY) = -1 ENOENT (No such file or directory) <0.000025>

13:55:09 stat("/data1/oracle11g/product/11.2.0.4/db_1/lib/tls/x86_64", 0x7fff3e3dacf0) = -1 ENOENT (No such file or directory) <0.000013>

13:55:09 open("/data1/oracle11g/product/11.2.0.4/db_1/lib/tls/libsqlplus.so", O_RDONLY) = -1 ENOENT (No such file or directory) <0.000014>

13:55:09 stat("/data1/oracle11g/product/11.2.0.4/db_1/lib/tls", 0x7fff3e3dacf0) = -1 ENOENT (No such file or directory) <0.000012>

13:55:09 open("/data1/oracle11g/product/11.2.0.4/db_1/lib/x86_64/libsqlplus.so", O_RDONLY) = -1 ENOENT (No such file or directory) <0.000014>

13:55:09 stat("/data1/oracle11g/product/11.2.0.4/db_1/lib/x86_64", 0x7fff3e3dacf0) = -1 ENOENT (No such file or directory) <0.000013>

13:55:09 open("/data1/oracle11g/product/11.2.0.4/db_1/lib/libsqlplus.so", O_RDONLY) = 3 <0.000019>

.........................

13:55:10 write(10, "\5z\0\0\6\0\0\0\0\0\3s\3\376\377\377\377\377\377\377\377\f\0\0\0\1\1\0\0\376\377\377"..., 1402) = 1402 <0.000016>
13:55:10 read(11, "\4\222\0\0\6\0\0\0\0\0\10\31\0\23\0\0\0\23AUTH_VERSION_S"..., 8208) = 1170 <5.886348>

13:55:15 open("/data1/oracle11g/product/11.2.0.4/db_1/rdbms/mesg/oraus.msb", O_RDONLY) = 9 <0.000075>

13:55:15 fcntl(9, F_SETFD, FD_CLOEXEC)  = 0 <0.000013>

  很可惜，不知道这个是什么意思，因为有很多weblogic连到这个库上，weblogic有自动重连的机制，然后把weblogic连接池的密码都修改完后，sqlplus连接速度正常了。真是乱拳打死老师傅啊，问题解决了。